- Viking silent phone observation unit- Allows supervisors to silently monitor employee phones without disrupting the activity at their workstation- 24 station capacity can be expanded to 240 stations at any time - Compatible with analog PABX/KSU stations - Monitor stations from an unused phone system line input or to a dedicated single line phone - Add remote observing with a RAD-AMP Remote Access Device - Built-in talk assist (dial *) - Dial up code can be programmed to match the station number - Cassette recorder output and Touch Tone control - Automatic gain control equalizes in and outbound conversation levels - Configurable for digital phones (requires the SO-24 AK and an extra pair of wires to each phone handset) - One year manufacturer's warranty